6jha

Crystal structure of NADPH bound AerF from Microcystis aeruginosa

spinqualitylabelsall models 6jha, resolution 1.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6jha is a 2 chain structure with sequence from Microcystis aeruginosa FACHB-905 = DIANCHI905. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.78Å Ligands: NDP, PGE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The 2-carboxy-6-hydroxyoctahydroindole (Choi) moiety is an essential residue for the antithrombotic activities of aeruginosins, which are a class of cyanobacterial derived bioactive linear tetrapeptides. Biosynthetic pathway of Choi is still elusive. AerF was suggested to be involved in the biosynthesis of Choi, and can be assigned to the short-chain dehydrogenase/reductase (SDR) superfamily. However, both the exact role and the catalytic mechanism of AerF have not been elucidated. In this study, functional and mechanistic analyses of AerF from Microcystis aeruginosa were performed. Observation of enzymatic assay demonstrates that AerF is a NADPH-dependent alkenal double bond reductase that catalyzes the reduction of dihydro-4-hydroxyphenylpyruvate (H2HPP) to generate tetrahydro-4-hydroxyphenylpyruvate (H4HPP), which is the third step of the biosynthetic pathway from prephenate to Choi. Comparative structural analysis indicates that ligand binding-induced conformational change of AerF is different from that of the other SDR superfamily reductase using H2HPP as a substrate. Analyses of NADPH and substrate analogue binding sites combined with the results of mutagenesis analyses suggest that a particular serine residue mainly involves in the initiation of the proton transfer between the substrate and the residues of AerF, which is an uncommon feature in SDR superfamily reductase. Furthermore, based on the observations of structural and mutagenesis analyses, the catalytic mechanism of AerF is proposed and a proton transfer pathway in AerF is deduced. Structural and functional investigation of AerF, a NADPH-dependent alkenal double bond reductase participating in the biosynthesis of Choi moiety of aeruginosin.,Qiu X, Wei Y, Zhu W, Fu J, Duan X, Jin H, Zhu P, Zhou C, Yan X J Struct Biol. 2019 Nov 11:107415. doi: 10.1016/j.jsb.2019.107415. PMID:31726097 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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